Partial Hydrogenation Of Acetylene Research Articles

Demonstration of a novel method for the controlled deposition of metals onto surfaces by preparation of a Pd–Hg/SiO2catalyst for the selective hydrogenation of alkynes to alkenes

Treatment of silica gel that has SiH functional groups bonded to the surface, with methanolic PdCI2 and then aqueous Hg2S04 affords a new catalytic material for the chemo- and stereo-selective partial hydrogenation of alkynes to Z-alkenes with a high degree of functional group compatibility.

Shape Selective Hydrogenation of Alkynes by Palladium (II) Complexes Supported on Hectorite

Clay-intercalated palladium (II) complexes were prepared and characterized by IR, XRD, and XPS measurements. Lithium hectorie (LHT) as a host compound and palladium (II) complexes, [Pd (NH3) 4] 2+ and [Pd (PDT) 3] 2+, as guest compounds were utilized. The basal spacings of [Pd (NH3) 4] 2+/LHT (PdAm/LHT) and [Pd (PDT) 3] 2+/LHT (PdPDT/LHT) were 1.30 nm and 2.21 nm, respectively. These intercalation complexes increased in basal spacing when swollen with solvents; i.e. 1.45 nm for PdAm/LHT and 2.94 nm for PdPDT/LHT in DMSO. These intercalation complexes were used as catalysts for the hydrogenation of different alkynes. The activities of the intercalation complexes remarkably depended on the basal spacing and the size of substrates. PdAm/LHT with smaller basal spacing did not hydrogenate phenyl and t-butylacetylene, while PdPDT/LHT bearing lager basal spacing hydrogenated phenylacetylene and aliphatic derivatives only except for t-butylacetylene. These intercalation complexes also exhibited high selectivity for the partial hydrogenation of alkynes.

Tritiated ethylene as precursor of a free vinyl cation.

A method for the partial hydrogenation of alkynes has been optimized for the synthesis of carrier-free politritiated ethylene. This molecule provides access to the chemistry of the free C 2H 3 + ion in both gaseous and condensed phase.